FLUORINATED HYDROCARBON COMPOUND, PROCESS FOR PRODUCING THE SAME, AND REFRIGERATOR OIL AND MAGNETIC RECORDING MEDIUM LUBRICANT

Abstract: A novel fluorinated hydrocarbon compound containing an oxygen or sulfur atom in its molecule, produced by the nucleophilic reaction of a fluorine compound with a hydrocarbon compound. This compound is useful as a lubricant for various applications and particularly excellent as an oil for refrigerators wherein hydrochlorofluorocarbon is used as the refrigerant and as a magnetic recording medium lubricant.

Description: The present invention relates to a compound which is usable generally as a lubricant and a process for preparing the compound, and more particularly to a fluorinated hydrocarbon compound containing an oxygen atom in its molecule and useful as a refrigerating machine oil or as a lubricant for magnetic recording media. The invention also concerns the use of said fluorinated hydrocarbon compound, and more particularly a refrigerating machine oil and a lubricant for magnetic recording media. The term "refrigerating machine" used herein includes heat pumps. BACKGROUND ART Refrigerating machine oil Heretofore known as refrigerating machine oils are mineral oils such as paraffinic oils or naphthenic oils and synthetic oils such as alkylbenzene oils, ester oils. These oils are used chiefly for refrigerating machines which employ trichlorofluoromethane (R-11), dichlorodifluoromethane (R-12) or the like as a refrigerant. In recent years, however, it has been suggested that chlorine-containing fully halogenated hydrocarbons such as R-11 or R-12 released into the atmosphere would deplete the stratospheric ozone layer, thereby inflicting a serious adverse influence on the ecosystem including humans on earth. Consequently an international agreement calls for the restriction of consumption and production of specific flons such as R-11 and R-12. It has been proposed to use CH 2 FCF 3 (R-134a) or like hydrogen-containing fluorinated hydrocarbons as a refrigerant substituting for R-11 or R-12. The proposed hydrocarbons are unlikely to deplete the ozone layer but poorly compatible with conventional refrigerator oils. Because of this defect, when the hydrogen-containing fluorinated hydrocarbon is used as a refrigerant in a refrigerator together with a conventional refrigerator oil, the refrigerator is made inoperative in a short time due to the lowered durability of a compressor, and the refrigerator capacity and coefficient of performance are significantly decreased. In view of said problem, fluorine-containing oils may be used as a refrigerator oil since the oils are considered highly compatible with hydrogen-containing fluorinated hydrocarbons. These compounds are commercially available under the trade names "Fomblin" (product of Montefluos Co., Ltd.), "Krytox" (product of E.I. du Pont de Nemours & Co., Inc.), "Demnam" (product of Daikin Industries Ltd.), etc. The compounds have repeating units of the following formulas as the main structure -(CF 2 CF 2 CF 2 -O)- wherein n and m are each an integer of 1 or more. However, these known fluorine-containing oils are not necessarily fully compatible with refrigerants. This is presumably because these fluorine-containing oils contain little or no hydrogen in the structure. Further it is difficult to use these fluorine-containing oils for commercial purposes since the monomers corresponding to said repeating units in the structure are expensive. When said hydrogen-containing fluorinated hydrocarbon is used as a refrigerant, fluorine- and hydrogen-containing oils are effectively used as a refrigerator oil in order to improve the compatibility between the refrigerant and refrigerator oil. Consequently the development of an expedient process for producing the fluorine- and hydrogen-containing oil is thought important to realize their use. Fluorine- and hydrogen-containing oils are disclosed in Japanese Unexamined Patent Publications No. 205491/1991 and No. 7798/1991. The disclosed oils, however, have drawbacks. For example, the oils contain, as the basic unit, a compound having a perfluoropolyether bond and the monomer used as the starting material is expensive. Moreover, because the fluorine-containing moiety of the monomer is basically COF-terminated, the reaction product of the monomer with a hydrocarbon compound is an ester and susceptible to hydrolysis. On the other hand, when a compound other than an ester is prepared, it is necessary to transform the end group -COF of the fluorine-containing compound to -CH 2 OH, for example, by reduction reaction. Consequently, the reaction requires a multi-step procedure. Since the refrigerator oil thus prepared is expensive, it may be difficult to realize the commercial use of the refrigerator oil. The polyester-based compounds disclosed in Japanese Unexamined Patent Publications No. 128991/1991 and No. 179091/1991 are reportedly highly compatible with R-134a, but are significantly hygroscopic and prone to hydrolysis or like decomposition because of the ester group present in the compound, posing a problem of durability. Lubricant for magnetic recording media To improve the travelling stability and the durability of magnetic recording median a method has been proposed which is to incorporate a lubricant into a magnetic layer or to coat a thin magnetic layer with a lubricant by coating methods such as dipping or spin coating. For example, the fluorine-containing polyether described in Japanese Unexamined Patent Publication No.113130/1986 are known as such lubricant. In preparing a coating composition using said fluorine-containing polyether, the polyether is not fully dispersed in a common hydrocarbon-based organic solvent. Consequently the lubricant is readily removed from the coated magnetic layer by sliding contact of the recording media with the magnetic head, thereby making the magnetic recording media unsatisfactory in the abrasion resistance and durability. Some fluorine-containing solvents are capable of fully dissolving fluorine-containing polyethers. Yet common solvents such as trichlorotrifluoroethane can no longer be used because of the recent problem of ozone layer depletion. Other fluorine-containing solvents (such as C 6 F 14 ) considered free of ozone layer depletion problem are expensive although able to dissolve conventional fluorine-containing polyethers. Further these solvents reportedly contribute to global warming and thus their use requires great care. OBJECTS OF THE INVENTION It is an object of the present invention to provide a compound which is advantageous in the high compatibility with hydrogen-containing halogenated hydrocarbons and in the good stability, the compound being useful as an oil in a refrigerating machine using a hydrogen-containing halogenated hydrocarbon as a refrigerant, and a process for preparing the compound. It is another object of the invention to provide a compound which is soluble in common organic solvents and which is useful as a lubricant for magnetic recording media, and a process for preparing the compound. It is a further object of the invention to provide a refrigerating machine oil and a lubricant for magnetic recording media for which said novel compound is used. DISCLOSURE OF THE INVENTION The novel compounds of the present invention are the fluorinated hydrocarbon compounds represented by the general formula II (R 5 O) d R 6 or the compounds which compound is obtained by reacting with polypropylene glycol having an average molecular weight of 1055, which compound is obtained by reacting with polybutylene glycol having an average molecular weight of 1358. The symbol d in the formula (II) is 1 or 2. Among the compounds of the formula (II), the compounds containing, as the substituent R 5 , a group having a fluorine/carbon atomic ratio of at least 0.6, preferably at least 1, more preferably at least 1.5 are suitable for use as a refrigerating machine oil and as a lubricant for magnetic recording media. The substituents represented by R 5 are shown below. (CF 3 ) 2 CF(CF 2 CF 2 ) n CH 2 CH 2 OCH 2 CH(OH)CH 2 - (n = integer of 0 - 10) CF 3 CF 2 (CF 2 CF 2 ) m CH 2 CH 2 OCH 2 CH(OH)CH 2 - (m = integer of 0 - 10) H(CF 2 CF 2 ) ℓ CH 2 CH 2 CH(OH)CH 2 - (ℓ = integer of 0 - 10) (CF 3 ) 2 CF(CF 2 CF 2 ) k CH 2 CH(OH)CH 2 - (k = integer of 0 - 10) CF 3 CF 2 (CF 2 CF 2 ) j CH 2 CH(OH)CH 2 - (j = integer of 0 - 10) When d in the formula (II) is 1, R 6 represents the monofunctional groups as mentionned below. When d in the formula (II) is 1, a polyalkylene glycol with the end of its molecule modified with an alkoxy group can be used as the starting material (precursor) useful for forming the polyether group (polyalkyleneglycol group) as the substituent of R 6 . Suitable polyalkylene glycols for use as the starting material are those having a kinematic viscosity at 40°C of 1 to 500 cst, preferably 3 to 350 cst, more preferably 5 to 200 cst. The examples of monofunctional groups represented by R 6 are given below. These groups are preferred in that starting materials are easily available in commercial manufacture. C n H 2n+1 - (n = integer of 10 - 30) C m H 2m-1 - (m = integer of 10 - 30) C h H 2h-3 - (h = integer of 10 - 30) CℓC ℓ H 2 l - ( l = integer of 1 - 10) Cℓ(CH 2 ) 7 CH = CH(CH 2 ) 8 - CH 3 (OCH 2 CH 2 ) k - (k = integer of 1 - 100) When d in the formula (II) is 2, R 6 represents a bifunctional group as mentioned below. When d in the formula (II) is 2, a polyalkylene glycol having the end of its molecule modified with an alkoxy group can be used as the starting material (precursor) useful for forming the bifunctional polyether group (bifunctional polyalkylene glycol group) as the substituent of R 6 . Suitable polyalkylene glycols for use as the starting material are those having a kinematic viscosity at 40°C of 1 to 500 cst, preferably 3 to 350 cst, more preferably 5 to 200 cst. The examples of bifunctional groups represented by R 6 are given below. These groups are preferred in that starting materials are easily available in commercial manufacture. -(C h H 2h )- (h = integer of 0 - 10) Process for preparing the compound (II) The compound (II) can be prepared by various processes. For example, when R 6 in the formula (II) is as defined above, d in the formula (II) is 1, and R 5 is any of the following substituents: H(CF 2 CF 2 ) ℓ CH 2 CH 2 CH(OH)CH 2 - ( l = integer of 0 - 10), CF 3 CF 2 (CF 2 CF 2 ) j CH 2 CH(OH)CH 3 - (j = integer of 0 - 10), or when d in the formula (II) is 2, and R 6 represents the following substituent: wherein t is an integer of 1 to 100, the corresponding compound (II) can be prepared typically by the reaction represented by the reaction formula (D) or (E) shown below. Reaction formula (D) (d=1 and R 6 = monofunctional group) Reaction formula (E) (d=2 and R 6 = bifunctional group) In the reaction formulas, R 5 represents the following substituents (CF 3 ) 2 CF(CF 2 CF 2 ) a CH 2 CH 2 - (a = integer of 0 - 10) CF 3 CF 2 (CF 2 CF 2 ) b CH 2 CH 2 - (b = integer of 0 - 10) H(CF 2 CF 2 ) c CH 2 - (c = integer of 0 - 10) R 5" represents the following substituents (CF 3 ) 2 CF(CF 2 CF 2 ) n CH 2 CH 2 O- (n = integer of 0 - 10) CF 3 CF 2 (CF 2 CF 2 ) m CH 2 CH 2 O- (m = integer of 0 - 10) H(CF 2 CF 2 ) l CH 2 - ( l = integer of 0 - 10) (CF 3 ) 2 CF(CF 2 CF 2 ) k - (k = integer of 0 - 10) CF 3 CF 2 (CF 2 CF 2 ) j - (j = integer of 0 - 10) R 6 is as defined above, and R 6" represents The starting compound (IX) is defined as above. The starting compound (X) are shown below. These compounds are preferred because of their ready availability and do not limit the invention. Specific-examples of the starting compound (XI) are shown below. These compounds are preferred because of their ready availability but do not limit the invention. (CF 3 ) 2 CF(CF 2 CF 2 ) a CH 2 CH 2 OH (a = integer of 0 - 10) CF 3 CF 2 (CF 2 CF 2 ) b CH 2 CH 2 OH (b = integer of 0 - 10) H(CF 2 CF 2 ) c CH 2 OH (c = integer of 0 - 10) Specific examples of the starting compound (XII) include wherein t is an integer of 1 to 100. These compounds are preferred because of their ready availability but do not limit the invention. These reactions can be conducted in the presence or the absence of a solvent. The amount of the solvent used is 0.1 to 100 times, preferably 0.5 to 10 times, more preferably 1 to 5 times, the total amount by volume of the starting compound (X) and the starting compound (IX) or the starting compound (XI) and the starting compound (XII). Examples of usable solvents are aprotic polar solvents such as methyl ethyl ketone, acetone, DMF, DMSO, NMP, sulfolane, diglyme, triglyme, ether, THF, chloroform, and dichloromethane. In these reactions, a Lewis acid catalyst can be used as a catalyst. The Lewis acid catalyst is used in an amount of 0.001 to 10 equivalents, preferably 0.01 to 5 equivalents, more preferably 0.1 to 2 equivalents, based on the total amount of the starting compounds used. Specific examples of Lewis acid catalysts are boron trifluoride, and adducts of boron trifluoride with ether. The reaction temperature for these reactions is -10 to 200°C, preferably 0 to 150°C, more preferably 10 to 100°C. The reaction pressure is 0 to 10 kg/cm 2 G, preferably 0 to 5 kg/cm 2 G, more preferably 0 to 2 kg/cm 2 G. The reaction time is 30 minutes to 100 hours, preferably 2 to 50 hours. The ratio of the starting compound (X) and the starting compound (IX) to be used or the ratio of the starting compound (XI) and the starting compound (XII) to be used, namely a (X)/(IX) equivalent ratio, or (XI)/(XII) equivalent ratio, is 0.01-20, preferably 0.5-10, more preferably 0.5-3. In these reactions, the starting compounds can be simultaneously charged or can be supplied by adding dropwise one of the starting compounds to the other or by blowing one to the other. Yet the invention is not limited in this respect. There is no specific limitation on the treatment method to be conducted after the reaction, namely the method for the recovery of the compound (II) from the reaction mixture. The compound can be purified by conventional methods. Stated more specifically, the reaction mixture is quenched in a large quantity of water and extracted with a water-immiscible solvent (such as S-3, dichloromethane, chloroform, etc.). The extract is washed with an acid, an alkali, a saturated aqueous solution of sodium chloride or the like, and dried over anhydrous sodium sulfate, or anhydrous magnesium sulfate. After filtration, the solvent is distilled off at reduced pressure from the filtrate, whereby the compound (II) is recovered. When required, the obtained product can be purified by vacuum distillation or column chromatography. Use of present compounds The compounds of the invention are excellent as an oil (refrigerator oil) for refrigerating machines which use as a refrigerant a hydrogen-containing halogenated hydrocarbon. The hydrogen-containing halogenated hydrocarbons referred to herein are not specifically limited and include, for example, hydrogen-containing fluorinated hydrocarbon (HFC), hydrogen-containing chlorinated fluorinated hydrocarbon (HCFC), etc. They are used singly or in mixture with each other. The abbreviation HFC used herein stands for a chlorine-free hydrogen-containing fluorinated hydrocarbon. Specific examples of HFC are given below. CHF 3 (HFC23) CH 2 F 2 (HFC32) CH 3 F (HFC41) CHF 2 CF 3 (HFC125) CHF 2 CHF 2 (HFC134) CF 3 CH 2 F (HFC134a) CHF 2 CH 2 F (HFC143) CF 3 CH 3 (HFC143a) CH 2 FCH 2 F (HFC152) CHF 2 CH 3 (HFC152a) CH 2 FCH 3 (HFC161) CHF 2 CF 2 CF 3 (HFC227ca) CH 2 FCF 2 CF 3 (HFC236cb) CH 3 CF 2 CF 3 (HFC245cb) CH 3 CF 2 CHF 2 (HFC254cb) CH 3 CH 2 CF 3 (HFC263fb) CF 3 CHFCF 3 (HFC227ea) The compounds of the present invention are suitable for use as an oil for refrigerating machines using, among the above refrigerant examples, HFC23, HFC32, HFC125, HFC134a, HFC143a, HFC152a, HFC227ca, HFC227ea, etc. HFC's can be used singly or in mixture. Exemplified below are mixtures of two or more of HFC's. Mixtures of two HFC's HFC32/HFC134a HFC125/HFC134a HFC125/HFC143a Mixtures of three HFC's HFC32/HFC125/HFC134a HFC23/HFC32/HFC134a HFC125/HFC143a/HFC134a HFC32/HFC125/HFC143a Specific examples of HCFC's are shown below. CHCℓF 2 (HCFC22) CHCℓ 2 CF 3 (HCFC123) CHCℓFCCℓF 2 (HCFC123a) CHF 2 CCℓ 2 F (HCFC123b) CHCℓFCF 3 (HCFC124) CHF 2 CCℓF 2 (HCFC124a) CHCℓFCHF 2 (HCFC133) CH 2 CℓCF 3 (HCFC133a) CCℓF 2 CH 2 F (HCFC133b) CHCℓ 2 CH 2 F (HCFC141a) CCℓ 2 FCH 3 (HCFC141b) CHF 2 CH 2 Cℓ (HCFC142) CHCℓFCH 2 F (HCFC142a) CCℓF 2 CH 3 (HCFC142b) CHCℓFCF 2 CF 3 (HCFC226ca) CH 2 CℓCF 2 CF 3 (HCFC235cb) CH 3 CF 2 CCℓCF 2 (HCFC244cc) CH 3 CHCℓCF 3 (HCFC253db) CH 3 CH 2 CCℓF 2 (HCFC262fc) When HCFC22, HCFC124, HCFC123, HCFC141b, HCFC142b or HCFC235cb among said examples are used as a refrigerant in refrigerating machines, the compounds of the present invention are especially suitable for use in said machine. HCFC's can be used singly or in mixture. When a mixture of HFC and HCFC is used, the component proportions are not specifically limited and may be selected from a proportion range in which the refrigerating machine can exhibit its highest capability. For use as a refrigerator oil, the compound of the invention may be mixed with conventional refrigerator oils which do not adversely affect the capability of the compound of the invention as the refrigerator oil. Use of such mixture can reduce the cost of refrigerator oils and renders the substrate more wettable. If mixed in suitable proportions, these oils immiscible with each other can be unexpectedly emulsified to form a markedly stable, homogeneous layer over a wide temperature range. In view of this advantage, the mixture can display the desirable capability of refrigerator oil when used in combination with a specific refrigerant. Examples of conventional refrigerator oils which can be used are mineral oils, such as paraffin oils or naphthene oils, alkylbenzenes, polybutenes, α-olefin oligomers, polyalkylene glycols, diesters, polyol esters, phosphoric esters, esters of silicic acid, silicones or polyphenyl ethers. EFFECTS OF THE INVENTION Because of high compatibility with hydrogen-containing halogenated hydrocarbons, the compound of the present invention is suitable for use as an oil for refrigerating machines using a hydrogen-containing halogenated hydrocarbon as a refrigerant. When employed in refrigerators together with a hydrogen-containing halogenated hydrocarbon (refrigerant), the compound of the invention is comparable or superior in the refrigerator capacity and coefficient of performance to conventional combinations of R-12 and mineral oil-based refrigerator oils. Further the compound of the present invention shows a high durability, corrosion resistance and abrasion resistance as a lubricant for magnetic recording media. Example Examples and Comparative Examples are given below to clarify the invention in further detail. [Preparation of refrigerating machine oil (fluorine-containing oil)] Processes for preparing lubricants (fluorinated hydrocarbon compounds) of the invention The processes for preparing lubricants according to the invention can be roughly divided into two types depending on the fluorine-containing compound and hydrocarbon compound to be used as the starting compounds, namely on which compound has nucleophilicity. According to the process of the present invention, the nucleophilic reaction can be either homogeneous or heterogeneous and either a gas phase or liquid phase reaction. In addition, the reaction is feasible with or without a solvent. A reaction catalyst need not be used but may be used. It is preferred to use a reaction catalyst, for the increase of reactivity, e g. inorganic alkalis such as KOH and NaOH, organic alkalis such as triethylamine, Lewis acid catalysts such as BF 3 OEt 2 (wherein Et represents an ethyl group) and AlCl 3 and the like. The reaction is carried out at a temperature of 0-200°C, preferably 40-140°C. In this case, the reaction time is 30 minutes to 48 hours, preferably 1-24 hours. The lubricant of the present invention comprises a fluorine-containing oil produced by subjecting said fluorine-containing compound and said hydrocarbon to nucleophilic reaction. The lubricants of the invention are not specifically limited, but suitable lubricants are those having a number average molecular weight of 200-100000, preferably 300-20000. Example 1 A 4-necked flask was charged with 8.5 g of 2-chloro-1-ethanol and 1.5 mℓ of BF 3 OEt. While the mixture was stirred at 75°C, 52.6 g of 3-perfluoro(7-methyloctyl)-1,2-epoxypropane was dropwise added and then stirred at 80°C. After completion of the reaction, water was added and the reaction mixture was extracted with diethyl ether. The organic layer was dried over MgSO 4 , filtered and concentrated under reduced pressure at 50°C, giving 60 g of an oily compound. Example 2 A 500-mL flask was charged with 100 g of isostearyl alcohol having the average molecular weight of 270, 100 mL of chloroform solvent and 0.5 mL of BF 3 etherate. While the mixture was heated at 60°C and refluxed, 194.6 g (0.37 mol) of perfluoroepoxy compound (CF 3 ) 2 CF(CF 2 ) 6 CH 2 C 2 H 3 O was slowly added dropwise through a dropping funnel. The heating and stirring were continued for 12 hours. After completion of the reaction, the reaction mixture was washed with a 10% NaHCO 3 solution and dried over anhydrous magnesium sulfate and the solvent in the filtrate was distilled off under reduced pressure, giving 281 g of a light yellow oily compound. Example 3 A 500-mL flask was charged with 50 g of isomyristyl alcohol having the average molecular weight of 214, 100 mL of chloroform solvent and 0.5 mL of BF 3 etherate. While the mixture was heated at 60°C and refluxed, 158.8 g (0.30 mol) of perfluoroepoxy compound (CF 3 ) 2 CF(CF 2 ) 6 CH 2 C 2 H 3 O was slowly added dropwise through a dropping funnel. The heating and stirring were continued for 12 hours. After completion of the reaction, the reaction mixture was washed with a 10% NaHCO 3 solution and dried over anhydrous magnesium sulfate and the solvent in the filtrate was distilled off under reduced pressure, giving 207.7 g of a colorless oily compound. Example 4 In a 4-necked flask, 200 g of polypropylene glycol having an average molecular weight of 1055 was dissolved in 200 cc of CH 2 Cℓ 2 and 0.03 mℓ of BF 3 OEt was added. Then 150 g of isoperfluorooctylpropoxy which had been heated and refluxed was dropwise added. After completion of the reaction, the reaction mixture was extracted with CH 2 Cℓ 2 and washed with saturated NaHCO 3 and pure water. The organic layer was separated, dried over Na 2 SO 4 , filtered and concentrated under reduced pressure at 50°C, giving 280 g of an oily compound. Example 5 In a 4-necked flask, 60 g of the epoxy compound and 163 g of polypropylene glycol having an average molecular weight of 1055 were dissolved in 200 cc of CH 2 Cℓ 2 , and 0.3 mℓ of BF 3 OEt was added dropwise with heating and refluxing. After completion of the reaction, the reaction mixture was extracted with CH 2 Cℓ 2 and washed with saturated NaHCO 3 and pure water. The organic layer was separated, dried over Na 2 SO 4 , filtered and concentrated under reduced pressure at 50°C, giving 120 g of an oily compound. Example 6 A 20 mℓ 4-necked flask was charged with 10.75 g (50 mmol) of isomyristyl alcohol of the following formula (1), 11 g of chloroform and 8 drops of boron trifluoride ether complex. The epoxy (26.3 g, 50 ml) of the following formula (2) was dropwise added at 65°C over a period of about 50 minutes and stirred with heating at about 65°C for 6 hours. After completion of the reaction, the reaction mixture was washed with 30 mℓ of chloroform and 100 mℓ of a 5% aqueous NaCO 3 solution, dried over anhydrous magnesium sulfate and filtered and the filtrate was concentrated, giving 28 g (yield 74%) of the objective compound. Example 7 A 4-necked flask was charged with 58 g of the epoxy compound and 150 g of polybutylene glycol having an average molecular weight of 1358, the temperature was elevated and 0.3 mℓ of BF 3 OEt was added dropwise. After completion of the reaction, the reaction mixture was extracted with CH 2 Cℓ 2 and washed with saturated NaHCO 3 and pure water. The organic layer was separated, dried over Na 2 SO 4 , filtered and concentrated under reduced pressure at 50°C, giving 200 g of an oily compound. [Physical properties of the compounds] Table 2 shows structural formulas and physical properties of the compounds obtained in Examples 1, 2, 3, 4, 5, 6 and 7. [Compatibility Test-1] The compounds obtained in Examples were tested for compatibility with HFC134a. The compounds (oils) obtained in Examples were placed in Pyrex test tubes 8 mm in inner diameter and 200 mm long. The tubes were evacuated into a vacuum, cooled with liquid nitrogen and charged with 1 g of a refrigerant, HFC134a (oil/refrigerant ratio 20/80 wt.%). The tubes were then sealed and placed in a thermostat held at a controlled temperature. After the temperature reached an equilibrium, the compounds were visually checked for the compatibility with the refrigerant and the phase separation temperature was determined at a low temperature. Table 3 shows the phase separation temperature at a low temperature. After compatibility test, the compounds obtained in Examples 4 and 5 were cooled to determine the phase separation temperature at a low temperature but failed to separate into phases even at -50°C. [Compatibility Test-2] The compounds obtained in Examples were tested for compatibility with HFC134a/HFC32. The compounds (oils) obtained in Examples were placed in Pyrex test tubes 8 mm in inner diameter and 200 mm long. The tubes were vacuumed, cooled with liquid nitrogen and charged with 1 g of a refrigerant, HFC134a/HFC32 (70/30 wt.%), (oil/refrigerant ratio 20/80 wt.%). The tubes were then sealed and placed in a thermostat held at a controlled temperature. After the temperature reached an equilibrium, the compounds were visually checked for the compatibility with the refrigerant and the phase separation temperature was determined at a low temperature. Table 3 shows the phase separation temperature at a low temperature. [Compatibility Test-3] The compounds obtained in Examples were tested for compatibility with HFC134a/HFC32/HFC125. The compounds (oils) obtained in Examples were placed in Pyrex test tubes 8 mm in inner diameter and 200 mm long. The tubes were vacuumed, cooled with liquid nitrogen and charged with 1 g of a refrigerant, HFC 134a/HFC32/HFC125, (40/30/30 wt.%), (oil/refrigerant ratio 20/80 wt.%). The tubes were then sealed and placed in a thermostat held at a controlled temperature. After the temperature reached an equilibrium, the compounds were visually checked for the compatibility with the refrigerant and the phase separation temperature was determined at a low temperature. Table 3 shows the phase separation temperature at a low temperature. [Compatibility Test-4] The compounds obtained in Examples were tested for compatibility with HFC134a/HFC32/HFC23. The compounds (oils) obtained in Examples were placed in Pyrex test tubes 8 mm in inner diameter and 200 mm long. The tubes were vacuumed, cooled with liquid nitrogen and charged with 1 g of a refrigerant, 134a/HFC32/HFC23 (70/25/5 wt.%), (oil/refrigerant ratio 20/80 wt.%). The tubes were then sealed and placed in a thermostat held at a controlled temperature. After the temperature reached an equilibrium, the compounds were visually checked for the compatibility with the refrigerant and the phase separation temperature was determined at a low temperature. Table 3 shows the phase separation temperature at a low temperature. [Phase separation temperature (°C)] Refrigerant 134A 32/134A 134A/32/125 134A/32/23 Example Test 1 Test 2 Test 3 Test 4 1 -40 0 0 0 2 -10 -10 -10 -10 3 -20 -20 20 -20 4 ≤-50 ≤-50 ≤-50 ≤-50 5 ≤-50°C ≤-50°C ≤-50°C ≤-50°C 6 20 -10 -20 5 [Compatibility Test-5] The compounds prepared in Example 7 (see Table 2) was tested for the solubility in various common solvents, i.e. methylethylketone (MIBK), n-hexane, toluene, methylene chloride, and i-propanol (IPA). Table 4 shows the results. A known fluorine-containing polyether (average molecular weight:4500), F(CF 2 CF 2 CF 2 O) n CF 2 CF 3 , was also tested as Comparative Example 7 with the results also shown in Table 4. Example MIBK Hexane Toluene Methylene chloride IPA 7 A B A A A Com. Ex.7 C C C C C In Table 4, the symbol A represents a solubility of at least 25 wt.%, B a solubility of at least 1 wt.%, and C an insolubility (a solubility of less than 1 wt.%). [Tape property test] Magnetic coating compositions of the following formula were prepared using the compound of Example 7 as lubricant. The compositions thus obtained were applied to a 14 µm-thick polyethylene terephthalate film to a thickness of 4 µm on dry bas dried, calendered and treated at 50°C for 80 hours. The magnetic film thus obained was cut to a width of 8 mm to provide a 8 mm video tape recorder. Formulation of magnetic coating composition (parts by weight) Co-containing needle-like γ-iron oxide 100 parts Polyol 10 parts Vinyl chloride/vinyl acetate copolymer 10 parts Lubricant 10 parts Polyisocyanate 5 parts MIBK 100 parts Toluene 100 parts The coefficient of friction µ of the magnetic tapes thus obtained was determined from the load when the tape was placed at an angle of 90° with one end of the tape under a load of 10 g and the other end thereof pulled at a speed of 10 cm/sec using ISO R468 steel cylinder (R 0 =25 µm, 100 mm diameter, v=5 cm/sec). The results are shown below. A known fluorine-containing polyester (average molecular weight:4500), F(CF 2 CF 2 CF 2 O) n CF 2 CF 3 , was also tested as the lubricant with the results shown as Comparative Example 8. Lubricant Coefficient of friction Example 7 0.25 Com. Ex.8 0.40 The above results show that the abrasion resistance of the magnetic recording medium was increased when the compounds of the present invention were used as lubricants.

Claims: A fluorinated hydrocarbon compound having at least one oxygen atom in the molecule and represented by the formula (II) (R 5 O) d R 6 wherein d is 1 or 2, R 5 is selected from the group consisting of (CF 3 ) 2 CF(CF 2 CF 2 ) n CH 2 CH 2 OCH 2 CH(OH)CH 2 - (n = integer of 0 - 10), CF 3 CF 2 (CF 2 CF 2 ) m CH 2 CH 2 OCH 2 CH(OH)CH 2 - (m = integer of 0 - 10), H(CF 2 CF 2 ) ℓ CH 2 CH 2 CH(OH)CH 2 - (ℓ = integer of 0 - 10), (CF 3 ) 2 CF(CF 2 CF 2 ) k CH 2 CH(OH)CH 2 - (k = integer of 0 - 10), or CF 3 CF 2 (CF 2 CF 2 ) j CH 2 CH(OH)CH 2 - (j = integer of 0 - 10), and when d is 1 R 6 is C n H 2n+1 - (n = integer of 10 - 30), C m H 2m-1 - (m = integer of 10 - 30), C h H 2h-3 - (h = integer of 10 - 30), CℓC ℓ H 2 l - ( l = integer of 1 - 10), Cℓ(CH 2 ) 7 CH = CH(CH 2 ) 8 -, CH 3 (OCH 2 CH 2 ) k - (k = integer of 1 - 100) , and when d is 2 R 6 represents -(C h H 2h )- (h = integer of 1 - 10) wherein t is an integer of 1 to 100 or the compounds which compound is obtained by reacting with polypropylene glycol having an average molecular weight of 1055, which compound is obtained by reacting with polybutylene glycol having an average molecular weight of 1358. The fluorinated hydrocarbon compound according to claim 1 wherein the compound of formula (II) contains, as the substituent R 5 , a group having a fluorine/carbon atomic ratio of at least 0.6. The fluorinated hydrocarbon compound according to claim 2 wherein the compound of formula (II) contains, as the substituent R 5 , a group having a fluorine/carbon atomic ratio of at least 1. The fluorinated hydrocarbon compound according to claim 3 wherein the compound of formula (II) contains, as the substituent R 5 , a group having a fluorine/carbon atomic ratio of at least 1.5. A process for preparing a fluorinated hydrocarbon compound according to any of claims 1 to 4, comprising reacting a compound represented by the formula wherein R 5" is (CF 3 ) 2 CF(CF 2 CF 2 ) n CH 2 CH 2 O- (n = integer of 0 - 10) CF 3 CF 2 (CF 2 CF 2 ) m CH 2 CH 2 O- (m = integer of 0 - 10) H(CF 2 CF 2 ) ℓ CH 2 - (ℓ = integer of 0 - 10) (CF 3 ) 2 CF(CF 2 CF 2 ) k - (k = integer of 0 - 10), or CF 3 CF 2 (CF 2 CF 2 ) j - (j = integer of 0 - 10) with an alcohol represented by the formula R 6 OH wherein R 6 is one of the following substituents: C n H 2n+1 - (n = integer of 10 -30) C m H 2m-1 - (m = integer of 10 - 30) C h H 2h-3 - (h = integer of 10 -30) CℓC ℓ H 2 l - ( l = integer of 1 - 10) Cℓ(CH 2 ) 7 CH = CH(CH 2 ) 8 - CH 3 (OCH 2 CH 2 ) k - (k = integer of 1 - 100) A process for preparing a fluorinated hydrocarbon compound according to any of claims 1 to 4, comprising reacting a compound represented by the formula R 5 OH wherein R 5 is one of the following substituents: (CF 3 ) 2 CF(CF 2 CF 2 ) a CH 2 CH 2 - (a = integer of 0 -10) CF 3 CF 2 (CF 2 CF 2 ) b CH 2 CH 2 - (b = integer of 0 - 10), or H(CF 2 CF 2 ) c CH 2 - (c = integer of 0 - 10) with a compound represented by the formula wherein R 6" is wherein t is an integer of 1 to 100. A lubricant comprising at least one fluorinated hydrocarbon compound according to any of claims 1 to 4. An oil for a refrigerating machine which uses as a refrigerant a hydrogen-containing halogenated hydrocarbon, the oil comprising at least one fluorinated hydrocarbon compound according to any of claims 1 to 4. A lubricant for magnetic recording media which comprises at least one fluorinated hydrocarbon compound according to any claims 1 to 4.

Inventors: FUJIWARA KATSUKI, HONDA YOSHITAKA, IDE SATOSHI, ISHIDA SATOSHI, OTSUKA TATSUYA, SEKI EIJI, YAMAGUCHI FUMIHIKO, YAMAMOTO IKUO, YAMANA MASAYUKI, FUJIWARA, KATSUKI, HONDA, YOSHITAKA, IDE, SATOSHI, ISHIDA, SATOSHI, OTSUKA, TATSUYA, SEKI, EIJI, YAMAGUCHI, FUMIHIKO, YAMAMOTO, IKUO, YAMANA, MASAYUKI, FUJIWARA, KATSUKI, YODOGAWA SEIS. DAIKIN IND.LTD., HONDA, YOSHITAKA, YODOGAWA SEIS. DAIKIN IND. LTD., IDE, SATOSHI, YODOGAWA SEISAKUSHO DAIKIN IND.LTD., ISHIDA, SATOSHI, SAKAI SEISAKUSHO, OTSUKA, TATSUYA, YODOGAWA SEIS. DAIKIN IND. LTD., SEKI, EIJI, YODOGAWA SEISAKUSHO DAIKIN IND. LTD., YAMAMOTO, IKUO, YODOGAWA SEIS. DAIKIN IND. LTD., YAMANA, MASAYUKI, YODOGAWA SEIS. DAIKIN IND.LTD.
Applicants: DAIKIN IND LTD, DAIKIN INDUSTRIES, LTD.
Application year: 1994
Main classification: C07C43
IPC codes: C10M171, G11B5, C07C43, C07C41, C10M105, C10M107, C09K5, C08G65, C10N40